Men are increasingly going off sex due to stress, depression and the inability to talk about their problems, experts have claimed.

A team at relationship counselling service, Relate, has reported a whopping 40 percent increase in the number of lazy blokes, admitting that, despite being physically able to have sex, they are not interested.

"Men used to come to us with impotence but Viagra has sorted some of that problem. What we have is a lot of men who say, as women did in the fifties, that they can have sex, but they don't want to. It's not rewarding,” it said.

"It counts as a psychosexual dysfunction, rather than just a relationship problem, because these men haven't simply gone off their partner but off sex altogether," the Daily Mail quoted Peter Bell of Relate as saying.

According to Prof Michael King of the Royal Free and University College Medical School in London, depression might be the problem.

"Men are most likely to suffer depression between the ages of thirty and fifty. One of the explanations is that men are less able to talk about their problems than women, or express their emotions," he said.

"Britain's work culture has gone from nine to five to extremely long hours, which makes for a very stressful life,” added Prof Cary Cooper of the British Association of Counselling and Psychotherapy.